Definition of buckhorn 

1 : the horn of a buck often : the substance of such a horn knives with buckhorn handles

3a : cinnamon fern

b or less commonly buckhorn plantain

(1) : narrow-leaved plantain

(2) : a Eurasian plantain (Plantago coronopus) sometimes grown for its slightly bitter lobed leaves

(3) : large-bracted plantain

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History and Etymology for buckhorn

Middle English, from buck + horn

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